Pallets: Assets `destroy_accounts` releases the deposit (#14443)

* assset accounts destroy releases the deposit

* enumerate

* Update frame/assets/src/functions.rs

Co-authored-by: Kian Paimani <[email protected]>

* import defensive from frame_support

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Co-authored-by: Gavin Wood <[email protected]>
Co-authored-by: Kian Paimani <[email protected]>
Co-authored-by: parity-processbot <>